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Geometry - Helix (Helicoid)
From Wikipedia:
"Helix A helix, plural helixes or helices, is a shape like a corkscrew or spiral staircase. It is a type of smooth space curve with tangent lines at a constant angle to a fixed axis. Helices are important in biology, as the DNA molecule is formed as two intertwined helices, and many proteins have helical substructures, known as alpha helices. The word helix comes from the Greek word ἕλιξ, "twisted, curved". (A "filled-in" helix – for example, a "spiral" ramp – is called a helicoid.)" DNA - single helical.jpg DNA - double DNA_double_helix-.jpg "Alpha Helix" https://en.wikipedia.org/wiki/Alpha_helix "Archimedes screw" shown in operation http://www.incois.gov.in/Tutor/scien...re10/screw.gif Auger auger.jpg HELICOID EJDYW0.jpg P1030993 copy.jpg CCDM2N.jpg Helicoid - Spiral stair: The designer developed his stair section, thus: Flighted substrate.jpg Made the shape into a heavy wood mock-up, maquette or "buck." 2X6 + 1in ply glued and screwed, then CNC milled in appropriate router-machine: AP1110691 copy.jpg And with some hammering here and there .... boom - whacka-whacka .... P1030882c.jpg
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. Last edited by crystallographic; 04-10-2020 at 05:43 PM. |
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The front side of this lectern has a helix shape. When I made it I found that it is pretty much a reverse. If you stretched one side in a wheel you would rotate the panel 180 degs and stretch the other side. For a helix you flip the panel so that it's rotated and upside down. Pull up a bit while wheeling and you'll get a helix. IMG_20200410_224252.jpg Last edited by RatRockx; 04-10-2020 at 04:58 PM. |
#3
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Quote:
Jo Joris, Ja, I sure had to know more about linear shaping to put this job in a twist. But this was not quite like other familiar reverse weirdness ..... weird reverse.jpg
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
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In the beginning ...
I had to grasp the nature of a shaped panel that twisted. P1030993.jpg And yet remained flat ... So, the panel started out flat. This part was easy. P1030050 copy.jpg I laid out my lines of shape, and I made a plan. P1030237 copy.jpg And I worked my plan. P1030205 copy.jpg And I stuck to my plan P1030335 copy.jpg Check fit. hammer hammer .... Check fit P1030343 copy.jpg ...and so on ..... ... not there yet ....
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. Last edited by crystallographic; 04-11-2020 at 01:37 PM. |
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Fascinating work there, Kent. Definitely not an 'everyday' job!
Did the sheet stiffen up some as the shape was induced? Also, did the final product need to be smoothed, and if so, how did you planish, or intend planishing, all the little hammer marks? TX
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Manny Remember that the best of men, are only men at best. |
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No Manny, not an everyday job - except when it happens everyday .... for weeks on end ...
P1030333 copy.jpg P1030317copy.jpg P1030439copy.jpg P1030444 copy.jpg P1030451 copy.jpg P1030315 copy.jpg P1030572 C.jpg When the shape wilds the panel sandbags are used to calm things down. P1030455 copy.jpg Yes, the 1.5mm (.063) steel hardens with hours of hammering. And yes the panel flip-flops quickly ... snapping hard enough to bite unwary fingers. Yes, it is a fight to push-pull the 40 lb 20sq. ft panels forth and back, accurately - with the added weight of the bags ... and with all that the panel has to be physically twisted to align nicely with the dies when hammering ..... Oh ... planishing ... yeah I have die sets for that sweetness ...
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. Last edited by crystallographic; 04-11-2020 at 02:04 PM. |
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this is absolute world class.
end of the flagpole incredible
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Bernhard |
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Vielen dank, Bernhard!
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
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While the geometry lesson may be lost on me, the ability to think (and work) big is obvious and impressive. Not to mention... that just looks like hard work!
Interesting. Looks good.
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Matt |
#10
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Thanks Matt. It feels like hard work, too. Planishing "seasick" contours ... was a challenge. P1030455 copy.jpg Had to come up with a "sailor" die set. P1030436c.jpg Something that can sail smoothly across the waves ... P1040016c.jpg Navigating rough spots ... P1040008c.jpg smooth sailing ... P1040011copy.jpg And so I modified one of our #6 air motors to hit softly ... P1030463copy.jpg and it changes out in a few seconds, uses the same air pressure, and on we go ...
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
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